Pyrographic instrument



C. R. POST PYROGRAPHIC INSTRUMENT Filed Jan. 19, 1922 INVENTOR 6% fifwz'i BY ,yg ATTORNEY Patented Feb. 10, 1925.

UNITED STATES CHARLES R. POST, OF NEW YORK, N. Y.

PYROGRAPHIC INSTRUMENT.

Application filed January 19, 1922. Serial No. 530,295.

To all whom it may concern Be it known that 1, CHARLES R. los'r, a citizen of the United States, and resident of New York city,,borough of Manhattan,

in the county of New York and State of New York, have invented certain new and useful Improvements in Pyrographic Instruments, of which, the following is aspecification.

My invention relates to improvements in electrically heated instruments adapted for use in writing or marking material, such as paper, also for use for soldering and analogous purposes, where heat is required at the point of contact of the instrument with the article to be marked, soldered or thelike.

The object of my invention is to provide a simple and highly etficient instrument of the character specified, wherein the heat derived i'rom the electric current will be applied as close as possible to the tip of the instrument to heat the same to the desired degree with a mininiumof electric current, and whereby to reduce radiation of heat throughout the instrument.

My invention also comprises novel details of improvement that will be more fully hereinafter set forth and then pointed out in the claims.

Reference is to be had to the accompanying drawings, toiming part hereof, where- 111- Figure 1 is a partly central sectional view of my improved pyrographic instrument;

Figure 2 is a section of a portion of Fig. l on an enlarged scale, and

Figure 3 is a cross section on line 3, 3, in Fi 2.

gimilar numerals of reference indicate corresponding parts in the several views.

The main barrel or handle member 1 of the instrument, which may be of any suitable insulating material, such as rubber or fiber, is shown in tubular form. At the op erating end the barrel is provided with a tubular tip portion 2, which may be of porcelain or other insulating material, suitably attached to or formed with the barrel 1. A. stylus or heating point is indicated at 3, which is located in and projects from the bore 2 of tip 2, the outer end of the stylus being suitably shaped for the purpose intended, as for application to the material to be burned or scorched. The tip 3 is shown leather, wood and the like, adapted hollow for part of its length, being provided with a bore 3 opening within the enlarged portion of the bore of tip 2. The tip 3 may be of suitable metalsuch as German-silver, nickel-silver, or the like. Within the bore of tip 3 is a coil 4 'of a resistance conductor, which is shown wound upon a tubular core or sleeve 5 of suitable insulating material, such as lavite, porcelain or the like, l/Vinding 4 and core 5 are shown within an insulating sleeve 6 located within bore 3 of stylus 3, insulation 6*, such as a disc being shown disposed at the inner end of bore 3", opposing the insulations 5 and 6. In the example illustrated conductors are indicated at 7, 8 extending longitudinally for a suitable distance within barrel 1 and united to the corresponding ends of resistance conductor 4. One end 7 of conductor 7 is shown extending .within the bore of core or sleeve 5, together with the corresponding portion 4* of conductor 4 which leads through a hole 5 ininsulating sleeve 5, near the outer end of the latter, the conductor 4 being wound from that end of sleeve 5 around the latter toward the opposite end The conductor 7 is shown coiled at 7 and the adjacent end of port-ion 4 of conductor at is located with said boil, the latter being compressed or squeezed against said end of conductor 4 to securely retain the latter with electrical contact with conductor 7. The conductor 8 is also shown provided with a coil 8 in which the adjacent end portion 4 of conductor t is located, said coil being compressed or squeezed against conductor 4 to make secure and electrical contact therewith. The conductors 7 and 8 as well as their aforesaid coils are shown located within corresponding insulating tubes 9 extending within the bore of barrel 1, which tubes are shown telescoped within insulating tubes 10 that receive the main lead conductors 11, 12, from a line circuit. The conductor 7 is shown provided with a coil 7* that receives the lead conductor 11 stripped from its insulation, and the conductor 8 is shown provided with a coil 8 which receives the lead conductor 12 stripped from its insulation. said coils being compressed or squeezed upon conductors 11 and 12 to make secure and electrical contact therewith. The conductors 7 and 8 will preferably be made of low heat conducting metal, such as iron, so as not to heat the barrel. The conductors 11 and 12 extend from the barrel and'may be connected with a source of electrical supply, such as an outlet socket from an electrical service supply, in any well known manner.

The forward portion of barrel 1 is shown provided with openings 13 for circulation of air and exit of heat. Barrel 1 is also shown provided with a lateral projection or disc 14', which will retain the heated stylus 3 raised when the instrument is resting upon a support.

In accordance with my improvement when the electrical current flows through the conductors described and the coil of the resistance conductor 4 the latter will become heated within the stylus, whereby the heat from said coil will heat the stylus. Since the coil or winding of resistance conductor 4 is located within the bore of stylus 3, the latter will be heated by radiation of heat from said coil enabling the quantity of current required for heating the stylus to be minimized and the current conserved,

whereby the stylus readily may be heated to the desired degree. Furthermore, the onstruction described enables the heating coil to be located relatively close to the operating end of the stylus so as to locate the heat as near as possible to said operating end, while at the same time the stylus incloses and protectsthe heating coil, the tubular portion of the stylus serving to conduct heat to its operating end. Since the stylus absorbs heat from the heating coil within it the radiating heat from the coil is not directly applied to tip 2, but must first heat the stylus, part of which heat is absorbed in the work, so that the temperature of the tip is kept at a relatively low point.

A further advantage of my improvement is that the stylus may be pushed through the bore of tip 2 until the stop or flange 3 of the stylus enga s the shoulder 2 of the tip, and the sty us may be secured in bore 2 of the tip by suitab e cement or by friction. The other parts may be assembled and then pushed to place within the barrel, the tip and the stylus, affording a simple, cheap and efiicient means of manufacturing the instrument. The parts may be readily dismantled forv repair and replacement by simply pulling the wiring and tubing from the barrel.

My improved instrument may be usel for various purposes, such as for writing upon checks and other documents, to scorch or burn the paper or other material to prevent alteration and forgery; for burning or marking wood, leather, and other material customary in the pyrographic art; for embellishing with the use of interposed meta] leaf, such as paper treated with gold,;silver and the like, and for analogous purposes.

Having now described my invention, what I claim is;

1. A pyrographic instrument having a hollow tip, a resistance conductor coiled within the tip, a barrel connected with the tip, conductors of low heat conducting material within the barrel connected with the corresponding ends of the resistance conductor, and insulated line conductors having ends located within the barrel and connected with adjacent ends of said second named conductors.

2. A pyrographic instrument comprising a barrel provided with a hollow stylus, a resistance conductor associated with the stylus, and conductors within the barrel and provided with coils, portions of said resistance conductor being located respectively within said coils, said coils being under compression against said portions of-s'aid resistance conductor to retain the latter in electrical contact with said coils, and insulated line conductors having ends located within the barrel and connected with adjacent ends of said second named conductors.

3. A pyrographic instrument comprising a barrel provided with a hollow stylus, a resistance conductor associated with the stylus, and conductors within the barrel and provided with coils, portions of resistance conductor being located respectively within said coils, said coils being under compression against said portions of said resistance conductor to retain the latter in electrical contact with said coils, said conductors having other coils at their ends opposite the first named coils, and lead conductors having their ends within the second named coils, the last .named coils being under compression against said lead conductors to retain the latter in electrical contact with the first named conductors.

4. A pyrographic instrument comprising a barrel provided with a hollow stylus, an insulator within the hollow stylus and provided with a bore and also having a hole communicating with said bore, a resistance conductor coiled upon the said insulator and having a portion extending through said -hole and bore, a conductor within the barrel provided with a coil and having an end extending beyond the coil into the bore of said insulator, another conductor within the barrel provided with a coil, the corresponding end portions of said-resistance conduc-- tor being located within said coils, the said coils being under compression against said conductor portions to retain the latter in electrical contact with said coils.

Signed at New York city, in the county of New York, and State of New York, this 17th day of January. A. D. 1922.

I CHARLES R. POST. 

